Thomas Bruederli wrote:
You can try to implement a plugin hook in program/steps/mail/show.inc where the etag is composed. Either the hook can manipulate/replace the hashing function that creates the etag or it just returns true/false to enable/disable caching at all. I'm not sure which approach would fit best.
BTW, there are other ugly bugs related to etags.
http://trac.roundcube.net/ticket/1485623